/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package javax.faces.component;
  
  
  import javax.el.ValueExpression;
  import javax.faces.context.FacesContext;
  import javax.faces.convert.Converter;
  
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFComponent;
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFProperty;
  
  /**
   * Displays a value to the user.
   */
  @JSFComponent(defaultRendererType = "javax.faces.Text")
  public class UIOutput extends UIComponentBase implements ValueHolder
  {
      public static final String COMPONENT_TYPE = "javax.faces.Output";
      public static final String COMPONENT_FAMILY = "javax.faces.Output";
  
      private Converter _converter;
  
      /**
       * Construct an instance of the UIOutput.
       */
      public UIOutput()
      {
          setRendererType("javax.faces.Text");
      }
  
      @Override
      public String getFamily()
      {
          return COMPONENT_FAMILY;
      }
  
      public Object getLocalValue()
      {
          return  getStateHelper().get(PropertyKeys.value);
      }
  
      /**
       * Gets The initial value of this component.
       * 
       * @return the new value value
       */
      @JSFProperty
      public Object getValue()
      {
          return  getStateHelper().eval(PropertyKeys.value);
      }
  
      /**
       * The initial value of this component.
       */
      public void setValue(Object value)
      {
          getStateHelper().put(PropertyKeys.value, value );
      }
  
      /**
       * An expression that specifies the Converter for this component.
       * <p>
       * The value can either be a static value (ID) or an EL expression. When a static id is
       * specified, an instance of the converter type registered with that id is used. When this
       * is an EL expression, the result of evaluating the expression must be an object that
       * implements the Converter interface.
       * </p>
       */
      @JSFProperty(partialStateHolder=true)
      public Converter getConverter()
      {
          if (_converter != null)
          {
              return _converter;
          }
          ValueExpression expression = getValueExpression("converter");
          if (expression != null)
          {
              return (Converter) expression.getValue(getFacesContext().getELContext());
          }
          return null;
     }
 
     public void setConverter(Converter converter)
     {
         this._converter = converter;
         if (initialStateMarked())
         {
             getStateHelper().put(PropertyKeys.converterSet,Boolean.TRUE);
         }
         // The argument converter must be inspected for the presence of the ResourceDependency annotation.
         //_handleAnnotations(FacesContext.getCurrentInstance(), converter);
     }
     
     private boolean _isSetConverter()
     {
         Boolean value = (Boolean) getStateHelper().get(PropertyKeys.converterSet);
         return value == null ? false : value;
     }
     
     public void markInitialState()
     {
         super.markInitialState();
         if (_converter != null && 
             _converter instanceof PartialStateHolder)
         {
             ((PartialStateHolder)_converter).markInitialState();
         }
     }
     
     public void clearInitialState()
     {
         if (initialStateMarked())
         {
             super.clearInitialState();
             if (_converter != null && 
                 _converter instanceof PartialStateHolder)
             {
                 ((PartialStateHolder)_converter).clearInitialState();
             }
         }
     }
     
     enum PropertyKeys
     {
          value
         , converterSet
     }
 
     @Override
     public Object saveState(FacesContext facesContext)
     {
         if (initialStateMarked())
         {
             Object parentSaved = super.saveState(facesContext);
             Object converterSaved = null;
             boolean nullDelta = true;
             if (!_isSetConverter() &&
                 _converter != null && 
                 _converter instanceof PartialStateHolder)
             {
                 //Delta
                 StateHolder holder = (StateHolder) _converter;
                 if (!holder.isTransient())
                 {
                     Object attachedState = holder.saveState(facesContext);
                     if (attachedState != null)
                     {
                         nullDelta = false;
                         converterSaved = new _AttachedDeltaWrapper(_converter.getClass(),
                             attachedState);
                     }
                 }
                 else
                 {
                     nullDelta = false;
                     converterSaved = null;
                 }
             }
             else if (_isSetConverter() || _converter != null)
             {
                 // A converter that does not implement StateHolder does not need
                 // to save/restore the state, so we can consider it inmutable.
                 // If Call saveAttachedState(), keep the value, but do not set
                 // nullDelta only if the converter was not set after markInitialState(),
                 // so if the parent returns null, this part will return
                 // null and when is restored, it will return null, but it prevents
                 // add the attached object into the state.
                 if (!_isSetConverter() && _converter != null &&
                     !(_converter instanceof StateHolder))
                 {
                     //No op. Note converterSaved is not taken into account if
                     //nullDelta is true.
                 }
                 else
                 {
                     //Full
                     converterSaved = saveAttachedState(facesContext,_converter);
                     // If _converter == null, setConverter() was called after
                     // markInitialState(), set nullDelta to false and save the
                     // null spot.
                     nullDelta = false;
                 }
             }
 
             if (parentSaved == null && nullDelta)
             {
                 //No values
                 return null;
             }
             else if (parentSaved != null && nullDelta)
             {
                 return new Object[]{parentSaved};
             }
             return new Object[]{parentSaved, converterSaved};
         }
         else
         {
             Object[] values = new Object[2];
             values[0] = super.saveState(facesContext);
             values[1] = saveAttachedState(facesContext,_converter);
             return values;
         } 
     }
 
     @Override
     public void restoreState(FacesContext facesContext, Object state)
     {
         if (state == null)
         {
             return;
         }
         
         Object[] values = (Object[])state;
         super.restoreState(facesContext,values[0]);
         // Have values.length == 1 considers _converter is nullDelta, in that
         // case, there is no need to do any changes, but note this will only work
         // if UIOutput does not have any more StateHolder properties!.
         if (values.length == 2)
         {
             if (values[1] instanceof _AttachedDeltaWrapper)
             {
                 //Delta
                 ((StateHolder)_converter).restoreState(facesContext,
                         ((_AttachedDeltaWrapper) values[1]).getWrappedStateObject());
             }
             else
             {
                 //Full
                 _converter = (javax.faces.convert.Converter) restoreAttachedState(facesContext,values[1]);
             }
         }
     }
     
     /*
     void _handleAnnotations(FacesContext context, Object inspected)
     {
         if (inspected == null) {
             return;
         }
         
         ResourceDependency annotation = inspected.getClass().getAnnotation(ResourceDependency.class);
         
         if (annotation == null)
         {
             // If the ResourceDependency annotation is not present, the argument must be inspected for the presence 
             // of the ResourceDependencies annotation. 
             ResourceDependencies dependencies = inspected.getClass().getAnnotation(ResourceDependencies.class);
             if (dependencies != null)
             {
                 // If the ResourceDependencies annotation is present, the action described in ResourceDependencies 
                 // must be taken.
                 for (ResourceDependency dependency : dependencies.value())
                 {
                     _handleResourceDependency(context, dependency);
                 }
             }
         }
         else
         {
             // If the ResourceDependency annotation is present, the action described in ResourceDependency must be 
             // taken. 
             _handleResourceDependency(context, annotation);
         }
     }
     
     private void _handleResourceDependency(FacesContext context, ResourceDependency annotation)
     {
         // If this annotation is not present on the class in question, no action must be taken. 
         if (annotation != null)
         {
             Application application = context.getApplication();
             
             // Create a UIOutput instance by passing javax.faces.Output. to 
             // Application.createComponent(java.lang.String).
             UIOutput output = (UIOutput) application.createComponent(COMPONENT_TYPE);
             
             // Get the annotation instance from the class and obtain the values of the name, library, and 
             // target attributes.
             String name = annotation.name();
             
             // Obtain the renderer-type for the resource name by passing name to 
             // ResourceHandler.getRendererTypeForResourceName(java.lang.String).
             String rendererType = application.getResourceHandler().getRendererTypeForResourceName(name);
             
             // Call setRendererType on the UIOutput instance, passing the renderer-type.
             output.setRendererType(rendererType);
             
             // Obtain the Map of attributes from the UIOutput component by calling UIComponent.getAttributes().
             Map<String, Object> attributes = output.getAttributes();
             
             // Store the name into the attributes Map under the key "name".
             attributes.put("name", name);
             
             // If library is the empty string, let library be null.
             String library = annotation.library();
             if (library != null && library.length() > 0)
             {
                 // If library is non-null, store it under the key "library".
                 attributes.put("library", library);
             }
             
             // If target is the empty string, let target be null.
             String target = annotation.target();
             if (target != null && target.length() > 0)
             {
                 // If target is non-null, store it under the key "target".
                 attributes.put("target", target);
             }
             else
             {
                 // Otherwise, if target is null, call UIViewRoot.addComponentResource(javax.faces.context.FacesContext, 
                 // javax.faces.component.UIComponent), passing the UIOutput instance as the second argument.
                 context.getViewRoot().addComponentResource(context, output);
             }
         }
     }
     */
 }